// NewMacVlanLink creates macvlan network link
//
// It is equivalent of running:
// ip link add name mc${RANDOM STRING} link ${master interface} type macvlan
// NewMacVlanLink returns MacVlaner which is initialized to a pointer of type MacVlanLink if the
// macvlan link was created successfully on the Linux host. Newly created link is assigned
// a random name starting with "mc". It sets the macvlan mode to "bridge" mode which is a default.
// It returns error if the link could not be created.
func NewMacVlanLink(masterDev string) (MacVlaner, error) {
macVlanDev := makeNetInterfaceName("mc")
if ok, err := NetInterfaceNameValid(masterDev); !ok {
return nil, err
}
if _, err := net.InterfaceByName(masterDev); err != nil {
return nil, fmt.Errorf("Master MAC VLAN device %s does not exist on the host", masterDev)
}
if err := netlink.NetworkLinkAddMacVlan(masterDev, macVlanDev, default_mode); err != nil {
return nil, err
}
macVlanIfc, err := net.InterfaceByName(macVlanDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
masterIfc, err := net.InterfaceByName(masterDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &MacVlanLink{
Link: Link{
ifc: macVlanIfc,
},
masterIfc: masterIfc,
mode: default_mode,
}, nil
}
// NewMacVlanLinkWithOptions creates macvlan network link and sets som of its network parameters
// passed in as MacVlanOptions.
//
// It is equivalent of running:
// ip link add name ${macvlan name} link ${master interface} address ${macaddress} type macvlan mode ${mode}
// NewMacVlanLinkWithOptions returns MacVlaner which is initialized to a pointer of type MacVlanLink if the
// macvlan link was created successfully on the Linux host. If particular option is empty, it sets default value if possible.
// It returns error if the macvlan link could not be created or if incorrect options have been passed.
func NewMacVlanLinkWithOptions(masterDev string, opts MacVlanOptions) (MacVlaner, error) {
if ok, err := NetInterfaceNameValid(masterDev); !ok {
return nil, err
}
if _, err := net.InterfaceByName(masterDev); err != nil {
return nil, fmt.Errorf("Master MAC VLAN device %s does not exist on the host", masterDev)
}
if err := validateMacVlanOptions(&opts); err != nil {
return nil, err
}
if err := netlink.NetworkLinkAddMacVlan(masterDev, opts.Dev, opts.Mode); err != nil {
return nil, err
}
macVlanIfc, err := net.InterfaceByName(opts.Dev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
if opts.MacAddr != "" {
if err := netlink.NetworkSetMacAddress(macVlanIfc, opts.MacAddr); err != nil {
if errDel := DeleteLink(macVlanIfc.Name); errDel != nil {
return nil, fmt.Errorf("Incorrect options specified. Attempt to delete the link failed: %s", errDel)
}
}
}
masterIfc, err := net.InterfaceByName(masterDev)
if err != nil {
return nil, fmt.Errorf("Could not find the new interface: %s", err)
}
return &MacVlanLink{
Link: Link{
ifc: macVlanIfc,
},
masterIfc: masterIfc,
mode: opts.Mode,
}, nil
}